Base for a chair



FIG. 1 is a perspective view of the base.

FIG. 2 is a top plan view of the base of FIG. 1.

FIG. 3 is a bottom plan view of the base of FIG. 1.

FIG. 4 is a side elevational view of the base of FIG. 1 between two of the radially extending arms; and,

FIG. 5 is a side elevational view of the base of FIG. 1 from a position in front of one of the radially extending arms. 

The ornamental design for a base for a chair, as shown and described. 